User Manual

Table Of Contents
CDU-C Combining and Distribution Unit
4 Function Description
This section describes the functions of CDU-C. The CDU-C can be divided into
the following functional parts:
TX part
RX part
The figure below is a block diagram of CDU-C (GSM 900) with duplexer.
TX1
TX/ RX Ant
TX2
Circ.
Circ.
Hybrid
comb.
Duplex
filter
MCU
RX 1
RX 2
RX 3
RX 4
RX 5
RX 6
RXBPRXDA
HL OUT
HL IN
P010163A
Splitter
Splitter
Splitter
Figure 1 Block Diagram for CDU-C with Duplexer (GSM 900)
The figure below is a block diagram of CDU-C (GSM 1800 and GSM 1900)
without duplexer.
5 (10)
EN/LZT 720 0277 Uen R1A